#include<iostream>
using namespace std;

int main()
{
    int n;
    while(cin>>n&&n)
    {
        int i=0;
        while(n!=1)
        {
            if(n%2==0) n /=2;
            else n =(3*n+1)/2;
            i++;
        }
        cout<<i<<endl;
    }
    return 0;
}
